s&box MCP Knowledgebase

Documentation, API references, code examples and community knowledge for s&box development.

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menu_bookDocumentation
May 5, 2026

Game Resources - s&box Documentation

Official s&box documentation for Game Resources - custom asset types. GameResource allows defining custom asset types that can be created in the editor and load…

menu_bookDocumentation
May 4, 2026

Game Static Class: ActiveScene, ChangeScene, TypeLibrary, Cookies, and Core State Properties

Game Static Class: ActiveScene, ChangeScene, TypeLibrary, and Core State The static class is the primary entry point for global game state in s&box. Core State …

codeAPI Reference
May 12, 2026

s&box IToolgunEvent: Toolgun selection interception

IToolgunEvent Interface API Reference IToolgunEvent is an interface for Components that want to intercept toolgun selection attempts. Implement to allow or reje…

codeAPI Reference
May 12, 2026

s&box IPhysgunEvent: Physgun grab interception

IPhysgunEvent Interface API Reference IPhysgunEvent is an interface for Components that want to intercept physgun grab attempts. Implement to allow or reject ph…

codeAPI Reference
May 12, 2026

s&box Global.ISpawnEvents: Spawn event callbacks

Global.ISpawnEvents Interface API Reference Global.ISpawnEvents is an interface for Components that want to listen to spawn events across the scene. Implement t…

menu_bookDocumentation
May 5, 2026

RPC Messages - s&box Documentation

RPC Messages Components can contain RPCs. An RPC is a function that when called, is called remotely too. Supported RPC arguments are the exact same as Sync prop…

menu_bookDocumentation
May 20, 2026

RPC Messages: Broadcast, Owner, Host with Filtering and Caller Info

Components can contain RPCs — functions that when called locally, are also called remotely. Supported RPC argument types are the same as Sync properties. Basic …

menu_bookDocumentation
May 20, 2026

Stats Service: Recording and Reading Player Statistics in s&box

Games can record per-player stats using . Stats can be queried individually, per-player, or globally. Recording Stats Increment a counter: Set a value directly:…

menu_bookDocumentation
May 20, 2026

WebSocket Connections with Auth Token Authentication in s&box

s&box supports WebSocket connections to external servers for custom networking or persistent data outside the local filesystem. Basic Connection and Messaging U…

menu_bookDocumentation
May 20, 2026

VirtualGrid: Virtualized Grid Panel for Large Item Collections

is a s&box UI Panel that virtualizes large item collections — only rendering visible cells. If you have thousands of items, it creates only the few on screen an…

menu_bookDocumentation
May 20, 2026

Prefab Instance Overrides: Property, Component, and GameObject Customization

Prefab instance overrides in s&box allow you to customize individual instances of a prefab without affecting the original or other instances. The instance remem…

menu_bookDocumentation
May 20, 2026

API Whitelist: Sandboxed Code Restrictions and Safe Alternatives

s&box uses a code whitelist to prevent access to classes and functions that could be used maliciously. Code that doesn't pass these checks will not be loaded in…

menu_bookDocumentation
May 20, 2026

Storage UGC: User-Generated Content with Steam Workshop Integration

The s&box Storage system provides a unified way to manage user-generated content in your game. Each storage entry is a self-contained folder with its own filesy…

menu_bookDocumentation
May 20, 2026

ActionGraph: Visual Scripting with Nodes, Links, and Control Flow

ActionGraph is s&box's visual scripting language. Each node describes an action or expression, and links between nodes carry values or signals. No C# coding req…

menu_bookDocumentation
May 20, 2026

WebSockets: External Server Communication with Auth Token Support

s&box allows WebSocket connections to interface with external servers. Common uses include custom networking and persistent data storage outside the local files…

terminalCode Example
May 12, 2026

s&box achievement unlocking with Rpc.FilterInclude targeting

s&box Achievement Unlocking with Rpc.FilterInclude This example shows achievement unlocking using s&box's Services.Achievements, Services.Stats, and Rpc.FilterI…

codeAPI Reference
May 12, 2026

s&box MetadataAttribute: Resource picker filtering

MetadataAttribute API Reference MetadataAttribute is a reusable property attribute that stores a string tag for resource picker filtering. The editor can read t…

codeAPI Reference
May 12, 2026

s&box MountMetadata: Mount fallback rendering

MountMetadata Component API Reference MountMetadata is attached to mount-spawned props to show a graceful bounding box and hint the player which game it's from …

codeAPI Reference
May 12, 2026

s&box SaveSystem: Scene save/load with metadata and event hooks

SaveSystem API Reference SaveSystem is a GameObjectSystem that captures differences between the current scene state and the original scene, enabling save/load f…

terminalCode Example
May 4, 2026

Sandbox: Player spawn flow with PlayerData, events, and NetworkSpawn

Player Spawn Flow in s&box Sandbox The Sandbox game uses a (a ) to handle player connections and spawning. Here's the full pattern: GameManager spawns players o…